Here are the data for the past $21$ months for actual sales of a particular product:

$\backslash$table$[[,$LAST YEAR,THIS YEAR$],[$January$,345,290],[$February$,395,375],[$March$,470,365],[$April$,460,475],[$May$,400,440],[$June$,470,325],[$July$,430,365],[$August$,325,280],[$September$,375,375],[$October$,535,],[$November$,570,],[$December$,550,]]$

Develop a forecast for the fourth quarter using a three$-$quarter, weighted moving average. Weight the most recent quarter $0\mathrm{.}50,$ the second most recent $0\mathrm{.}25,$ and the third $0\mathrm{.}25.$ Do the problem using quarters, as opposed to forecasting separate months. $($Round your answer to $2$ decimal places.$)$

Forecast for the fourth quarter $$